<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card class="box-card">
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="roleList" border stripe>
                <!-- 角色权限展开列表 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',index === 0 ? 'bdtop' : '', 'vcenter']"
                            v-for="(item1,index) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}
                                </el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二三级权限 -->
                            <el-col :span="19">
                                <el-row :class="['bdtop',index2 === 0 ? '' : 'bdtop', 'vcenter']"
                                    v-for="(item2,index2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">
                                            {{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3,index2) in item2.children" :key="item3.id"
                                            closable @close="removeRightById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini"
                            @click="showSetRightDialog(scope.row)">分配权限
                        </el-button>
                    </template>
                </el-table-column>
            </el-table>
            <!-- 分配权限全选的树形dialog对话框 -->
            <el-dialog title="权限粉喷" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClosed">
                <el-tree :data="rightsList" :props="treeProps" show-checkbox node-key="id" default-expand-all
                    :default-checked-keys="defKeys" ref="treeRef">
                </el-tree>
                <span slot="footer" class="dialog-footer">
                    <el-button @click="setRightDialogVisible = false">取 消</el-button>
                    <el-button type="primary" @click="alloRights">确 定</el-button>
                </span>
            </el-dialog>
        </el-card>
    </div>
</template>

<script>
    export default {
        data() {
            return {
                roleList: [], //所有角色列表
                setRightDialogVisible: false, //控制dialog权限分配的显示隐藏
                rightsList: [], //所有权限数据
                treeProps: {
                    label: 'authName', //权限的名称
                    children: 'children' //后台提供的树形结构多级权限的名称
                }, //树形控件的树形绑定对象
                defKeys: [], //默认选择的节点id值数组
                roleId: '' //当前即将分配权限的角色Id
            }
        },
        created() {
            this.getRolesList();
        },
        methods: {
            // 获取所有角色列表
            async getRolesList() {
                const { data: res } = await this.$http.get('roles');
                if (res.meta.status == 200) {
                    this.roleList = res.data;
                } else {
                    this.$message.error('获取角色列表失败');
                }
            },
            // 根据id删除对应的权限
            async removeRightById(role, rightId) {//根据用户id跟角色权限id做delete响应
                const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(error => error);
                // 判断用户的选择根据confirm组件的=>我们自定义的confirmResult的返回值
                if (confirmResult == 'confirm') {
                    const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
                    if (res.meta.status == 200) {
                        // 这里如果重调this.getRolesList的话会刷新页面,所以把当前角色的权限数据赋值为服务器返回的删除后的最新数据
                        role.children = res.data;
                        this.$message.success('删除权限操作成功');
                    } else {
                        this.$message.info('取消了删除操作');
                    }
                } else {
                    this.$message.info('取消了删除操作');
                }
            },
            // 展示分配权限对话框默认勾选已有权限
            async showSetRightDialog(role) {
                this.roleId = role.id;
                //获取所有权限数据
                const { data: res } = await this.$http.get('rights/tree');
                if (res.meta.status == 200) {
                    this.rightsList = res.data;
                    //递归获取三级节点(下面定义的方法)
                    this.getLeafKeys(role, this.defKeys);
                    this.setRightDialogVisible = true;
                } else {
                    this.$message.error('获取权限数据失败');
                }
            },
            // 通过递归形式获取角色项所有权限id保存到defKeys数组中
            getLeafKeys(node, arr) {
                // 如果当前选择对象的children为空代表没有子权限了
                if (!node.children) {
                    return arr.push(node.id);
                } else {
                    node.children.forEach(item => {
                        this.getLeafKeys(item, arr);
                    })
                }
            },
            // 监听分配权限对话框的关闭事件
            setRightDialogClosed() {
                this.defKeys = []; //清空角色权限id
            },
            // 点击为角色分配权限
            async alloRights() {
                const keys = [
                    ...this.$refs.treeRef.getCheckedKeys(), //tree组件提供的方法(获取选择复选框的id值)
                    ...this.$refs.treeRef.getHalfCheckedKeys() //tree提供组件的方法(获取半选状态复选框的id值)
                ]
                const idStr = keys.join(',');
                const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr });
                if (res.meta.status == 200) {
                    this.getRolesList();
                    this.setRightDialogVisible = false;
                    this.$message.success('分配权限成功!');
                } else {
                    this.$message.error('分配权限失败!')
                }
            }
        }
    }
</script>

<style lang="scss" scoped>
    .bdtop {
        border-top: 1px solid #eee;
    }

    .bdbottom {
        border-bottom: 1px solid #eee;
    }

    .vcenter {
        display: flex;
        align-items: center;
    }
</style>